The keyword phrase "11 september 2025 berapa hijriah" is an interrogative phrase used to request the Islamic calendar equivalent of a specific Gregorian date. Grammatically, "11 september 2025" functions as a noun phrase identifying the subject, while "berapa hijriah" (what is the Hijri date) serves as the interrogative component. The term "hijriah" acts as an adjective. Based on astronomical calculations, the Gregorian date of 11 September 2025 corresponds to 17 Rabi' al-Awwal 1447 AH (Anno Hegirae).
This conversion is determined by the fundamental differences between the Gregorian (solar) and Hijri (lunar) calendars. The Gregorian calendar is based on the Earth's orbit around the sun, averaging 365.24 days per year. In contrast, the Hijri calendar is based on the lunar cycle, with a year consisting of 12 months that last approximately 354 or 355 days. This ~11-day difference causes Hijri dates to shift annually relative to the Gregorian calendar. Furthermore, a Hijri day traditionally begins at sunset, not at midnight. Therefore, the date 17 Rabi' al-Awwal 1447 AH commences at sunset on 10 September 2025 and concludes at sunset on 11 September 2025.
The provided date, 17 Rabi' al-Awwal 1447 AH, is based on computational models like the Umm al-Qura calendar. It is important to note that for religious observances, some communities rely on the physical sighting of the crescent moon (rukyatul hilal) to mark the beginning of a new month. This practice can occasionally result in a one-day variation from the calculated date depending on geographical location and atmospheric conditions. For official purposes, the calculated date is standard, but for specific religious events, confirmation from local Islamic authorities is often recommended.
